How to distinguish good quality nail drill bit?

1. Distinguish from nail drill bit’s shank
Check whether the bottom of the drill bit shank has rounded corners and whether the bottom is smooth. If there are cutting marks, this shows that the work is very rough, and it will also damage the grinding machine handle (affecting the handle life)
2. Measurement of concentricity and beat of nail drill bit
Place the drill bit on a stable table and gently roll it to see if the handles jump up and down. The high-quality nail drill bit’s shank part does not have any change, but the inferior drill bit can see the shank beating up and down greatly. When using it, the nail drill bit will obviously feel the beating (the nail drill bit beats big, the guests also It will feel uncomfortable and everything will be based on the comfort of the guests.)
3. The rotation direction of the nail drill bit
Hold the handle of the nail drill bit in the right hand and rotate it gently. The left hand uses the thumb and index finger to feel the gear part of the nail drill bit. If you rotate forward and back and feel different, it means that this can only be polished in one direction, and it cannot be polished back and forth. If the two directions rotate smoothly, then this is a grinding head that can be polished back and forth.
4. Difference in drill bit tooth profile
Take a flat, slightly flat gear (C-tooth), look at the top (from top to bottom) and see if the nail drill bit gears have the same spacing and whether the gear shape is a raised equilateral triangle if the tooth shape It is just a raised triangle with a U-shaped arc, which means that the drill bit is just an industrial drill bit and it is not suitable for nail art. If the industrial drill bit is used for nail art, it may produce hot and stagnant phenomena. (Thousands of grinding heads on the market, quality choice is the key)
5. How to choose the right nail drill bit
The drill bit used in industry can clearly see that the gears are one diamond-shaped structure, and the real drill bit for nails clearly sees a three-dimensional gear bulge, and the grooves are also clearly visible.